package com.hmdp.service.impl;

import cn.hutool.Hutool;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;


import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //判断手机号是否正确
        boolean phoneInvalid = RegexUtils.isPhoneInvalid(phone);
        if(phoneInvalid){
            return Result.fail("手机号输入有误");
        }
        //生成验证码
        String code = RandomUtil.randomNumbers(6);
        //存到redis

        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);


        log.debug("发送短信验证码成功，验证码：{}", code);
        //返回结果
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //手机号
        String phone = loginForm.getPhone();
        boolean phoneInvalid = RegexUtils.isPhoneInvalid(phone);
        if(phoneInvalid){
            return Result.fail("手机号输入有误");
        }
        //验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        String code = loginForm.getCode();
        if(cacheCode == null || !code.equals(cacheCode)){
            return Result.fail("验证码有误");
        }
        //一致否,用手机号查用户
        User user = query().eq("phone", phone).one();

        if(user == null){
            //不存在，则创建
            user = createUserWithPhone(phone);
        }
        String token = UUID.randomUUID().toString(true);

        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((F,V)->V.toString()));

        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);

    }

    @Override
    public Result sign() {
        //拿到用户
        Long userId = UserHolder.getUser().getId();
        if (userId == null) {
            return Result.ok("用户未登录");
        }
        //字符串
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //转化日期为这个月day几
        int dayOfMonth = now.getDayOfMonth();
        //写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1 ,true);

        //返回
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //拿到用户
        Long userId = UserHolder.getUser().getId();
        if (userId == null) {
            return Result.ok("用户未登录");
        }
        //字符串
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //转化日期为这个月day几
        int dayOfMonth = now.getDayOfMonth();
        List<Long> results = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if (results == null || results.isEmpty()) {
            return Result.ok(0);
        }
        Long num = results.get(0);

        if (num == null || num == 0) {
            return Result.ok(0);
        }
        int count = 0;
        while (true) {
            // 6.1.让这个数字与1做与运算，得到数字的最后一个bit位  // 判断这个bit位是否为0
            if ((num & 1) == 0) {
                // 如果为0，说明未签到，结束
                break;
            }else {
                // 如果不为0，说明已签到，计数器+1
                count++;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }


    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomNumbers(6));
        save(user);
        return user;
    }
}
